Tubing machine



May 1, 1923. Y

J. L. MAHONEY TUBING MACHINE 2 Sheets-Sheet 1 Filed Nov. '7 1919 $5 M3 attomae Patented May 1, 1923.

UNITED STATES PATENT OFFICE.

JEREMIAH L. MAHONEY, OF NEW HAVEN. CONNECTICUT, ASSIGNOR TO GOODYEARS INDIAIRUBBER GLOVE MANUFACTURING COMPANY, A. CORPORATION OF CON- NECTICUT.

TUBING MACHINE.

Application filed November 7, 1919. Serial No. 336,294.

To all whom it may concern:

Be it known that I, JEREMIAH L. MA- HONEY, a citizen of the United States, residin at New Haven, county of New Haven. and btate of Connecticut, have invented new and useful Improvements in Tubing Machines, of which the following is a full, clear, and exact description.

This invention relates to a machine for making tubing from plastic material, more particularly to a machine for making tubing from sheet rubber stock.

It has been common previously to make tubing from sheet stock by cutting it into strips of the desired width and joining the edges of such strips by rolling or hammering, the edges being cemented in some cases and in other cases pressure alone being relied on to firmly unite them.

The object of the present invention is to provide a machine for making tubing of rubber or similar material directly from sheet stock without the necessity of cutting, rolling, hammering or cementing the stock.

A second object is to provide a machine for making tubing in which the seam will be as strong as or stronger than the remalnder of the tubing.

A further object is to provide a machine for making a plurality of tubes from the stock at a single operation.

A still further object is to decrease the cost of making the tubing by eliminating many of the operations required in the present methods of making tubing.

In the drawings,

Fig. 1 is a front elevation of the machine with parts broken away and in section.

Fig. 2 is a top plan viewof the machine.

Referring to the drawings, the numeral 1 is applied to the main frame of the machine. Mounted in the base of the frame is a motor 2 which by means of chain 3 drives a sprocket 4 mounted on the main shaft 5 of the machine. Also mounted on the main shaft is a ear 6 meshing with a gear 7 secured on t e shaft 8 of the left handtube forming roll 9. The shaft 8 also carries a gear 10 meshing with a gear 11 of the same size mounted on the shaft 12 of the right hand tube forming roll 13, whereby both rolls are driven at the same speed. The left hand roll 9 is mounted in fixed bearing blocks 14, while the right hand roll 13 is mounted in movable bearing blocks 15, the adjustment of said blocks being effected by means of the screws 16. The tube forming rolls 9 and 13 are formed with co-acting series of circumferential projections 17, for a purpose to be later explained. Brackets 18 are mounted at each side of the frame 1 and carry the shafts of the stock rolls 19. The stock unwound from each roll 19 passes between feed and guide rolls '20 and 21 mounted in brackets 22. Each upper roll 21 is loosely mounted in the forked upper end of the brackets 22 and under the action of gravity presses the stock against the lower roll. Each stock sheet then passes back and around a roll 23, mounted in slotted hearing brackets 24. Each roll 23 is formed with a series of rounded circumferential projections 25, as shown in Fig. 2. From the rolls 23 the stock sheets then pass between the tube forming rolls 9 and 13. The rolls 20 are driven from the main shaft in the following manner: A sprocket 26 on the end of. the main shaft is connected by a chain 27 to a sprocket 28 on the end of the right hand roll 20. The main shaft 5 also carries a gear 29 meshing with a gear 30 secured on a short shaft 31, on the outer end of which shaft is a sprocket 32 which by a chain 33 is connected to a sprocket 34 mounted on the shaft of the left hand roll 20. As the stock is wound from the roll 19 the liner material is stripped therefrom and passes around the stripping roll 35 and is Wound on a. roll 36. The roll 36, which is mounted in slotted bearings 36', rests by gravity on the roll 35 and is frictionally driven by the latter. A guide roll 37 carried b the outer side of bracket 18 prevents contact of the liner with the roll 36 as it is stripped from the stock. The stock feeding arrangement on both sides of the machine is the same in all respects, except that the right hand guide roll 37 is dlsposed within its bracket 18 in order that the lining may pass around the right hand roll 35 in the same direction as on the left hand side, both rolls 35 being driven in the same direction. The rolls 35 are driven from the main shaft in the following manner: A gear 38 on the main shaft 5 meshes with a gear 39 on a shaft 40 dis posed below the shaft 5. Sprockets 41 on shaft 40 are connected by chains 42 to sprockets 43 carried by, the respective rolls 35. The gearing is such that the rolls 37 are driven at approximately the same speed as the rolls 9 and .13. After the stock passes between the tube forming rolls it falls upon an inclined apron -11 moving over rolls -15 and =16. The upper roll 46 is mounted in bearing brackets 47 carried by the main frame, which brackets have a series of bearing slots 48 therein. and by disposing the roll '16 in different ones of these slots 48 the tension of the apron 44 may be varied. In the present instance the apron is not positivelv driven, but is operated by weight of the material falling upon it. It is obvious.

however, that it may be positively drivcn if desired. Extending across the top ot the machine between the tube forming rolls 9 and 13 is a bar 49 having a bore 50 therein with which a supply pipe 51 is connected. Mounted in the lower side of the bar 49 and in communication with the bore 50 are a series of blast nozzles 52 one of which is disposed between each adjacent pair of pro jections 17 on the rolls. By means of these nozzles a blast of air and talc may be blown into the tubes as they are formed to prevent adhesion of their walls. At the base of the apron 44 means for cutting the tubes into predetermined lengths are disposed, which means comprise a blade carried by a frame 5-1 mounted on a rock shaft The blade is spirally disposed in its frame, as in a lawn mower. A rock aim 56 extends downwardly from one end of the rock shaft and is connected by a link 57 to one end of a lever 58 pivoted at 59. The other end of the lever carries a follower 60 travelling in the cam groove 61 on the cam wheel 62, which latter is mounted on the shaft 40. Coacting with the movable blade 53 of the cutter is a relatively fixed blade 63, which blade is pivotally mounted at one end at 64 while near the other end a. bolt 65 passes freely through the blade. Interposed between the head of the bolt and the blade is a coil spring 66, which tends to keep the fixed blade in intimate contact with the movable blade during the shearing action. From the cutter the lengths of tubing pass to an apron 67 and are carried away.

In operation the stock is drawn from the rolls 19. passes between the rolls 20 and 21 and back over the rolls 23. The action of the roll 23 is to slightly stretch the sheet of stock transversely due'to the projections 25 which allow the material to sink between said projections thereby causing a stretching action. The stock then passes between the tube forming rolls 9 and 13 and the two sheets of stock are joined along parallel lines longitudinally of the sheets by the compressing action of the projections 17 on the rolls. The main body portions of the coacting projections 17 are spaced apart just far enough so that in compressing the double layer of sheet stock it will be reduced at the junction point to about the same thickness as the remainder of the tube. The density being increased at this point by the pressure, the joint formed is very strong. However the extreme tip or peripheral portions of these projections are so close together that the stock will be substantially severed along the center of the junction lines. It will be noted that the rolls 36, which are driven by frictional contact with the rolls 35, may move upwardly in their bearings 36' as the size of the roll increases, but as the roll 35 is always driven at the same peripheral speed the roll 36 will be likewise so driven irrespective of its size. The machine may be used with stock rolls as above described, or it mav be operated in direct connection with calendering machines, in which case the brackets 18 and the means for winding the lining material may be omitted. The tubing may of course be made of various diameters by varying the spacing of the projections 17 on the tube forming rolls, and the tubing may be used for any desired purpose. By varying the actuating cam for the cutter mechanism the tubing may be cut in desired lengths.

Having thus described my invention,what I claim and desire to protect by Letters Patent is:

1. A machine for making tubing from sheeted plastic stock comprising a pair of rolls having coacting series of circumferential projections, means for feeding two sheets of stock between said rolls, and means for discharging an adhesion preventing powder between said sheets at points between adjacent projections.

2. A machine for making tubing from sheeted plastic stock comprising a pair of rolls having co-acting series of circumferential projections, means for feeding two sheets of stock between said rolls, means for slightly stretching said sheets transversely prior to their passage between the rolls, and means for discharging air andv powder between said sheets at points between adjacent projections.

3. A machine for making tubing from sheeted plastic stock comprising a pair of rolls each having a series of circumferential projections, corresponding projections on the rolls being slightly spaced apart, a series of blast nozzles extending between adjacent projections, means for feeding two sheets of stock between said rolls, and means for cutting the material into predetermined lengths after passing between said rolls.

4. A machine for making tubing from sheeted plastic stock comprising means for joining two sheets of stock by pressure along a series of narrow parallel areas and simultaneously substantially severing them within said areas, and stationary means independent of the formed tubing for treating it to prevent adhesion of its walls between said areas.

5. A machine for making tubing from sheeted plastic stock, comprising a pair of rolls, means carried thereby for joining two sheets of stock along a series of narrow parallel areas, said means including means for substantially severing the sheets within said areas, means for adjusting said rolls, and means for discharging a blast of adhesion preventing substance within said sheets be tween each pair of parallel areas.

6. A machine for making tubing from sheeted plastic stock com rising a pair of coacting sheet guiding an feeding rolls, an opposed pair of similar rolls, stretching rolls one coacting with each of said pairs of rolls, each stretching roll having a series of rounded circumferential projections on its periphery, and a centrally disposed pair of rolls having aligned coacting series of circumferential projections for uniting the sheets by pressure.

7. A machine for making tubing from sheeted plastic stock comprising means for joining two sheets of stock by pressure along a series of parallel lines, means for slightly stretching the sheets transversely to said lines prior to joining them, and stationary means independent of the formed tubing for treating it to prevent adhesion of its walls between said lines.

8. A machine. for making tubing from sheeted plasticstock comprising a pair of rolls for the wound up stock and its liner, guiding and stretching rolls coacting with each of said first rolls, stripping and windup rolls for the liner unwound from each stock roll, a pair of tube-forming rolls, a main shaft, means for driving the tubeforming rolls in unison therefrom, means for driving the stripping and wind-up rolls in synchronism with the tube-forming rolls,

and means for driving the uiding rolls.

Signed at New Haven, onnecticut, this 31st day of October 1919.

JEREMIAH L. MAHONEY. 

